<template>
  <el-upload
      class="avatar-uploader"
      :action="backEndUrl"
      :show-file-list="false"
      :on-success="handleAvatarSuccess"
      :before-upload="beforeAvatarUpload"
  >
    <img v-if="imageUrl" :src="imageUrl" class="avatar"/>
    <el-icon v-else class="avatar-uploader-icon">
      <Plus/>
    </el-icon>
  </el-upload>
</template>

<script lang="ts" setup>
import {ref} from 'vue'
import type {UploadProps} from 'element-plus'
import {ElMessage} from 'element-plus'
import {Plus} from '@element-plus/icons-vue'
import config from "@/stores/config";

const imageUrl = ref('')

const backEndUrl = config.uploadUrl

const emit = defineEmits(['update:imageUrl'])

const handleAvatarSuccess: UploadProps['onSuccess'] = (
    response,
    uploadFile
) => {
  let data = response.data
  if (data === undefined || data.length === 0) {
    ElMessage.error('上传失败：' + response.message)
    return false
  }
  imageUrl.value = URL.createObjectURL(uploadFile.raw!)
  emit('update:imageUrl', 'http://' + response.data[0]) // 发送 imageUrl 到父组件
}

const beforeAvatarUpload: UploadProps['beforeUpload'] = (rawFile) => {
  if (rawFile.type !== 'image/jpeg') {
    ElMessage.error('Avatar picture must be JPG format!')
    return false
  } else if (rawFile.size / 1024 / 1024 > 2) {
    ElMessage.error('Avatar picture size can not exceed 2MB!')
    return false
  }
  return true
}
</script>

<style scoped>
.avatar-uploader .avatar {
  width: 178px;
  height: 178px;
  display: block;
}
</style>

<style>
.avatar-uploader .el-upload {
  border: 1px dashed var(--el-border-color);
  border-radius: 6px;
  cursor: pointer;
  position: relative;
  overflow: hidden;
  transition: var(--el-transition-duration-fast);
}

.avatar-uploader .el-upload:hover {
  border-color: var(--el-color-primary);
}

.el-icon.avatar-uploader-icon {
  font-size: 28px;
  color: #8c939d;
  width: 178px;
  height: 178px;
  text-align: center;
}
</style>